JPH01270454A - printing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to a printing device for printing still images. [Prior Art j] In a printing device that prints still image video signals using a thermal transfer method, it is common to capture data for one screen into a memory and read the data sequentially in accordance with the printing speed. [Problem to be Solved by the Invention 1] Conventional printing apparatuses of this type convert input data to correct ink characteristics, image receiving paper characteristics, etc. before printing. However, when printing on paper with low smoothness, the dots are not transferred because the ink does not come into contact with the recesses of the paper, resulting in so-called missing dots, resulting in a significant deterioration in image quality. However, there was a problem in that the printing time for the L line had to be slowed down, which slowed down the speed at which one image was printed. There is also the problem that increasing the applied voltage to provide sufficient energy results in an expensive system. The present invention is intended to solve the above-mentioned problems, and its purpose is to print on paper with low smoothness without changing the time it takes to print one image, and with an inexpensive system. It is characterized by high image quality.

[Means to solve the problem]

The printing apparatus of the present invention includes a first memory capable of storing a plurality of lines of binarized still image video signals, a data processing section and an address control section of the first memory, and a second memory for printing. a memory, a data processing section for printing, an address control section for the second memory, means for printing, an oscillator that determines the processing speed of the processing section for printing, and a signal output from the oscillator. , a selector for selecting a signal output from the oscillator and a signal output from the frequency division, and means for printing a still image video signal within one field period. When printing by processing two scanning lines, switch the selector depending on the receiving paper to print two lines in one field period, or print one of the two scanning lines in one field period.
You can choose whether to print lines or not. [Example J] The present invention will be described in detail below based on an example. FIG. 16 is a block diagram of the printing apparatus of the present invention. l
is the first memory, 2 is the first memory and address control unit, 3 is the second memory, 4 is the data processing for printing and address t3q control unit of the second memory, 5 is the selector, and 6 is the 7 is an oscillator, 8 is a printing means, and 9 is an external switch. Two lines of data of the still image video signal stored in the first memory (1) are processed by the data processing section (2) and the address control section (2) and stored in the second memory (3). The data stored in the second memory 3 is processed by the data processing section 4 for printing, and is transferred to the printing means 8 and printed. At this time, the data processing section 4 for printing processes data using the signal output from the selector 5 (that is, the data processing speed is determined by the frequency of the signal output from the selector 5). , and the processing speed determines the printing time for one line. Therefore, in the case of highly smooth image receiving paper (image receiving paper that does not cause missing dots even if two lines of data are printed within the L field period), the output of the oscillator 7 can be changed from the selector 5 using the external switch 9. Two lines of data are printed within one field period. In addition, in the case of receiving paper with low smoothness (receiving paper that causes missing dots when two lines of data are printed within the L field period), the output signal of oscillator 7 is frequency-divided by 1/2 using external switch 9. When the signal is output from the selector 5 and two lines are printed within the one field period, one line is printed in twice the printing time of one line.In this case, from the transferred first memory. One of the two output lines of data is not printed. [Effects of the Invention] As described above, the printing device of the present invention can switch the printing time of one line λ depending on the smoothness of the image receiving paper, and with the highly smooth image receiving paper, high resolution image quality can be obtained. This has the effect of providing good image quality without missing dots when used with low-strength receiving paper.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a printing apparatus that is an embodiment of the present invention. 1...first memory 2...Data processing section and first memory address control section 3...Second memory 4...Data processing section and second memory address control section 5...Selector 6...minute period 7... Oscillator 8...Printing means 9...External switch that's all Applicant: Seiko Epson Corporation Agent: Patent attorney Kisanbe Suzuki (1 other person) N1 account

Claims (1)

[Claims] A first memory capable of storing a plurality of lines of binarized still image video signals, a data processing section and an address control section of the first memory, a second memory for printing, and data for printing. a processing section and an address control section of the second memory; an oscillator that determines the processing speed of the processing section for printing; a dividing frequency that divides the signal output from the oscillator; and a selector for selecting a signal to be output from the divided period and a signal to be output from the divided period, and a means for printing, and the still image signal is outputted from two within one field period.
When performing scanning line processing and printing, switch the selector depending on the receiving paper to print two lines within one field period, or
A printing apparatus characterized in that it is possible to select which one of two scanning lines to print two lines in one field period.